Century Drill Tool 26214 7/32" Pro Grade Cobalt Drill Bit Made from M35 steel with 5% cobalt, Century?s Cobalt drill bits are designed to cut through extremely hard metals, including stainless steel No center punch needed: Century 135-degree quick-cut points are self-centering and penetrate faster with less pressure?will not ?walk? or ?wander? at the starting surface Extremely heat resistant, must be used and operated in power units that have a RPM speed of 1,500 or more for maximum efficiency Made in the U.S.A. Use with Cutting Oil when drilling metal.